1 files changed, 6 insertions, 0 deletions
diff --git a/js/src/ds/BitArray.h b/js/src/ds/BitArray.h
index bdd78873fd..f8a6aad455 100644
--- a/js/src/ds/BitArray.h
+++ b/js/src/ds/BitArray.h
@@ -99,6 +99,12 @@ class BitArray {
     return map[elementIndex];
   }
 
+  // Update a word at a time.
+  void setWord(size_t elementIndex, WordT value) {
+    MOZ_ASSERT(elementIndex < nbits);
+    map[elementIndex] = value;
+  }
+
   static void getIndexAndMask(size_t offset, size_t* indexp, WordT* maskp) {
     MOZ_ASSERT(offset < nbits);
     static_assert(bitsPerElement == 32, "unexpected bitsPerElement value");